Please I need summary about the cell membrane and the cell wall and cytoplasm..

Which element provides strength to the exoskeleton of clams and oysters

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

Describe the function of the endomembrane system? what organelles are involved?